Table 2

Line ratios and estimated column densities of the observed GMCs.


[C II]/12CO(1–0) 482 4236/692
[C II]/12CO(2-1) 142 1223/150
[C I]/12CO(1–0) 6.5 –/9.4
[C I]/12CO(2–1) 1.9 –/2.4
12CO(4–3)/12CO(1–0) 20.7 21.1(–)
N[CII] /[1017cm-2]a 1.4 0.9/1.6

PDR model results

n⟩  [103 cm-3] 5.0 10/2.0
Mtot   [106M] 20 2.0/15
χ   [Draine] 7 300/5

Notes. For GMC E we give the values for the high/low velocity components. The PDR fit assumes a distance of 3.9 Mpc. The line ratios were calculated from line-integrated intensities in units of erg s-1 cm-2 sr-1.


Assuming a high-temperature and high-density limit and optical thin emission.

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